A hybrid absorption–adsorption method to efficiently capture carbon

Huang Liu, Bei Liu, Li-Chiang Lin, Guangjin Chen (), Yuqing Wu, Jin Wang, Xueteng Gao, Yining Lv, Yong Pan, Xiaoxin Zhang, Xianren Zhang, Lanying Yang, Changyu Sun (), Berend Smit () and Wenchuan Wang
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Huang Liu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Bei Liu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Li-Chiang Lin: University of California
Guangjin Chen: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Yuqing Wu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Jin Wang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Xueteng Gao: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Yining Lv: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Yong Pan: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Xiaoxin Zhang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Xianren Zhang: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology
Lanying Yang: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Changyu Sun: State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Berend Smit: University of California
Wenchuan Wang: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Removal of carbon dioxide is an essential step in many energy-related processes. Here we report a novel slurry concept that combines specific advantages of metal-organic frameworks, ion liquids, amines and membranes by suspending zeolitic imidazolate framework-8 in glycol-2-methylimidazole solution. We show that this approach may give a more efficient technology to capture carbon dioxide compared to conventional technologies. The carbon dioxide sorption capacity of our slurry reaches 1.25 mol l−1 at 1 bar and the selectivity of carbon dioxide/hydrogen, carbon dioxide/nitrogen and carbon dioxide/methane achieves 951, 394 and 144, respectively. We demonstrate that the slurry can efficiently remove carbon dioxide from gas mixtures at normal pressure/temperature through breakthrough experiments. Most importantly, the sorption enthalpy is only −29 kJ mol−1, indicating that significantly less energy is required for sorbent regeneration. In addition, from a technological point of view, unlike solid adsorbents slurries can flow and be pumped. This allows us to use a continuous separation process with heat integration.

Date: 2014
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DOI: 10.1038/ncomms6147

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